The need for simple and valid diagnostic criteria for these disorders which are best defined by their symptoms, has led to the search of clusters of positive symptoms that are thought of as characteristic for patients with functional disorders [].Abstract Questionnaires are the most widely used data collection methods in educational and evaluation research.Reliabilityprocesses indicated that the SQ is reliable: Cronbach’s alpha 0.94 for the global SQ and between 0.80-0.91 for the foursubscales.

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Following these five steps in questionnaire development and testing will enhance data quality and utilization of research.

Questionnaires are the most frequently used data collection method in educational and evaluation research.

Location of pain was a significant distinguishing factor, patients with functional dyspepsia having no lower abdominal pain (p Functional bowel disorders form a heterogeneous group of clinical syndromes related to the gastrointestinal tract that present no histological, endoscopic or imaging abnormalities and are not the result of infectious or metabolic disease.

Due to our limited understanding of their pathogenesis, functional bowel disorders remain largely a diagnosis of exclusion.

Groves (1987) defines measurement error as the "discrepancy between respondents' attributes and their survey responses" (p. Development of a valid and reliable questionnaire involves several steps taking considerable time.

I am designing a questionnaire for my dissertation.

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Diagnosis was based on detailed clinical and laboratory evaluation.

They also found that a third of the studies reviewed did not report procedures for establishing validity (31%) or reliability (33%).

Development of a valid and reliable questionnaire is a must to reduce measurement error.

The final questionnaire consists of 29 items and the psychometrics indicated that it is valid and reliable.